the Belgian black marble shelf with outset rounded ends, above a frieze applied with running scrolling foliate gilded electrotype metal appliques, the massive fluted column jambs applied with bellflower pendants raised on polygonal feet, the carved oak and walnut overmantel with an arched mirror plate bordered by inlaid marmo verde panels, the cornice centered by a portrait roundel depicting Isaac Newton in full relief, the flanking panels each with twin outset ionic order columns above the turned waisted socles to support figures personifying science and the arts,